US4683477A - Ink jet print head - Google Patents

Ink jet print head Download PDF

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Publication number
US4683477A
US4683477A US06/901,669 US90166986A US4683477A US 4683477 A US4683477 A US 4683477A US 90166986 A US90166986 A US 90166986A US 4683477 A US4683477 A US 4683477A
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United States
Prior art keywords
print head
ink
head body
ink jet
reservoir
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US06/901,669
Inventor
Hilarion Braun
Fletcher Bray
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Eastman Kodak Co
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Eastman Kodak Co
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Publication date
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Priority to US06/901,669 priority Critical patent/US4683477A/en
Assigned to EASTMAN KODAK COMPANY, ROCHESTER, NY., A CORP. OF NJ. reassignment EASTMAN KODAK COMPANY, ROCHESTER, NY., A CORP. OF NJ. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BRAY, FLETCHER H., BRAUN, HILARION
Application granted granted Critical
Publication of US4683477A publication Critical patent/US4683477A/en
Assigned to SCITEX DIGITAL PRINTING, INC. reassignment SCITEX DIGITAL PRINTING, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EASTMAN KODAK COMPANY
Assigned to EASTMAN KODAK COMPANY reassignment EASTMAN KODAK COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCITEX DITIGAL PRINTING, INC.
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14362—Assembling elements of heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/14—Mounting head into the printer

Definitions

  • the present invention relates to the field of ink jet printing, and more particularly to improvements in ink jet print heads.
  • the ink jet print head 10 includes an elongated rectangular print head body 12 of high acoustic Q material such as stainless steel.
  • the print head body 12 has a length L that is substantially greater than the other dimensions a and b.
  • the size of the body, with respect to the Q of the material is selected to exhibit a resonant frequency in the longitudinal vibration mode at or very near to the ink drops frequency produced by the ink jet print head 10.
  • the print head body 12 defines an ink reservoir 14, opening in a slot 16 in one end of the print head body 12.
  • An orifice plate 18 defining a plurality of orifices 20 is fixed over the slot 16.
  • a pump 22 supplies ink under pressure from an ink supply 24 to the reservoir 14 via ink supply tube 26 and an ink supply channel 28 defined by the print head body 12. Ink is forced out of the orifices 20 to define a plurality of ink jets.
  • An ink outlet channel 30 and ink outlet tube 32 allow the reservoir to be flushed.
  • a pair of piezoelectric transducers 34 (only one of which is shown) are driven by a periodic wave form from an oscillator 36, to excite the longitudinal mode of vibration in the print head body 12.
  • the print head body is mounted by integral tabs 38 located at a nodal plane, so that the vibration of the print head is not transferred to or affected by the mounting.
  • the longitudinal vibration of the print head body is transferred to the orifice plate 18 to thereby stimulate the ink jets to separate uniformly into drops.
  • the ink supply and outlet tubes 26 and 32 are made from a material selected to have a vibrational impedance substantially different from the print head body 12, such as flexible polymeric material, in an attempt to reduce the effect of the tubes on the vibrations of the print head body.
  • the problems noted above are solved by the present invention by connecting rigid ink supply and outlet tubes to the print head body at a nodal plane, and employing the rigid tubes to mount the ink jet print head by holding the tubes in a fixture.
  • Internal channels are formed in the print head body, from the supply and outlet tubes located at the nodal plane to the ink reservoir. To isolate the acoustic vibrations of the ink in the internal channels from the vibrations of the orifice plate, the internal channels are offset from the reservoir in a direction perpendicular to the long axis of the print head body.
  • the print head body is formed from two slabs of material, grooves representing the reservoir and internal channels are machined into one face of one of the slabs.
  • the other slab has plane surfaces.
  • the slabs are attached together to form the print head body.
  • Functional inlet and outlet tubes are provided on one side of the print head body, and mounting studs are provided on the other side. The inlet and outlet tubes and the mounting studs are held in a mounting fixture.
  • FIG. 1 is an exploded perspective view of an ink jet print head according to the present invention
  • FIG. 2 is a perspective view showing the ink jet print head according to the present invention, and the mounting fixture;
  • FIG. 3 is a perspective view of the prior art ink jet print head.
  • the ink jet print head 10 includes a print head body 12 formed by two halves 12a and 12b.
  • the two halves of the print head body are machined from rectangular slabs of stainless steel.
  • One of the slabs (12a) has grooves machined in one face thereof to define the ink reservoir 14 and the ink supply and outlet channels 28 and 30.
  • the supply and outlet channels 28 and 30 emerge on the opposite face of the slab 12a in the region of a nodal plane to provide access to the ink supply and outlet tubes 26 and 32 respectively.
  • the other slab 12b has a plane face on one side, and a pair of holes 31 for receiving mounting studs 33 on the other side.
  • the two slabs of stainless steel are brazed together, face-to-face, to form the print head body 12.
  • the orifice plate 18 is fixed to the print head body over the open end of the ink reservoir 14.
  • Rigid (e.g. stainless steel) supply and outlet tubes 26 and 32 and rigid mounting studs 33 are connected to the print head body at the nodal plane and serve for mounting the print head body.
  • the print head body 12 is mounted by holding the supply and outlet tubes 26 and 32 and the mounting studs 33 in a frame 40 having grooves 42 and 44 for receiving the tubes and mounting studs. In practice, some tolerance is provided in the fit between the grooves and the tubes and studs.
  • the print head 10 is set in the frame 40 in an alignment jig (not shown), and the tubes and studs are potted in the grooves using a curable epoxy.
  • the inventor discovered through experimentation that acoustic vibrations of the ink in the supply and outlet channels 28 and 30 (see FIG. 1) will interfere with the proper stimulation of the ink jets.
  • the supply and outlet channels 28 and 30 are offset from the reservoir 14 such that the acoustic vibrations in the vertical columns of the channels are substantially isolated from the reservoir 14.
  • the print head body is not easily machined from a solid block. For this reason, the preferred method of fabricating the print head body is by constructing the two halves and brazing them together. An alternative method of fabrication is by casting the print head body 12. However, this method has not proven entirely satisfactory because of the difficulty of removing the core material.
  • a print head body according to the present invention was constructed from stainless steel.
  • the overall dimensions of the print head body 12 were 3.2 cm. long by 1.2 cm. wide by 0.6 cm. thick.
  • An orifice plate having 64 orifices was attached to the print head body 12.
  • the piezoelectric transducers 34 (see FIG. 2) were fixed to the edges of the print head body 12.
  • a feedback transducer 46 was attached to the side of the print head body having the mounting studs 33.
  • the feedback transducer 46 was employed in the driver circuit as described in the above referenced U.S. Pat. No. 4,563,688.
  • the print head body was adjusted in the frame 40 as described above, and assembled in an ink jet printer.
  • the print head was driven at a frequency of ⁇ 75 Khz to perform ink jet printing.
  • the print head according to the present invention exhibited substantially improved performance over the prior art print head, showing a decreased sensitivity to external vibrations, and less critical requirements for the mass and location of the ink supply and outlet lines
  • the present invention is useful in the field of ink jet printing, and has the advantage that the ink jet print head is less susceptible to external vibrations of the ink supply tubes. Mounting of the ink jet print head is facilitated, and the location and mass of the lines to the ink supply tubes are less critical.

Abstract

An ink jet print head of the type having an elongated rectangular print head body that is vibrated at its resonant frequency to stimulate formation of ink drops is provided with a rigid ink supply tube connected to the print head body at a nodal point and is mounted by the rigid supply tube.

Description

TECHNICAL FIELD
The present invention relates to the field of ink jet printing, and more particularly to improvements in ink jet print heads.
BACKGROUND ART
U.S. Pat. No. 4,563,688 issued Jan. 7, 1986 to H. Braun discloses an ink jet print head for continuous-multijet-, ink jet printing. As shown in FIG. 3, the ink jet print head 10 includes an elongated rectangular print head body 12 of high acoustic Q material such as stainless steel. The print head body 12 has a length L that is substantially greater than the other dimensions a and b. The size of the body, with respect to the Q of the material is selected to exhibit a resonant frequency in the longitudinal vibration mode at or very near to the ink drops frequency produced by the ink jet print head 10. The print head body 12 defines an ink reservoir 14, opening in a slot 16 in one end of the print head body 12. An orifice plate 18 defining a plurality of orifices 20 is fixed over the slot 16.
A pump 22 supplies ink under pressure from an ink supply 24 to the reservoir 14 via ink supply tube 26 and an ink supply channel 28 defined by the print head body 12. Ink is forced out of the orifices 20 to define a plurality of ink jets.
An ink outlet channel 30 and ink outlet tube 32 allow the reservoir to be flushed. A pair of piezoelectric transducers 34 (only one of which is shown) are driven by a periodic wave form from an oscillator 36, to excite the longitudinal mode of vibration in the print head body 12. The print head body is mounted by integral tabs 38 located at a nodal plane, so that the vibration of the print head is not transferred to or affected by the mounting. The longitudinal vibration of the print head body is transferred to the orifice plate 18 to thereby stimulate the ink jets to separate uniformly into drops.
The ink supply and outlet tubes 26 and 32 are made from a material selected to have a vibrational impedance substantially different from the print head body 12, such as flexible polymeric material, in an attempt to reduce the effect of the tubes on the vibrations of the print head body.
Although, the use of such polymeric material substantially reduces the effect of the tubes on the vibrational properties of the print head body 12, experiments have determined that there are still some undesirable effects on the vibration of the print head body. For example, relatively small variations in the mass and/or location of the tubes have been observed to cause large changes in the vibrational amplitude and small changes in the longitudinal resonant frequency of the print head body 12. Furthermore, the mounting mechanisms employing the integral tabs 38 requires extremely precise machining of the components to effect accurate placement of the print head, thus increasing the cost of manufacture of the print head.
It is the object of the present invention therefore to provide an improved means for supplying ink to, and mounting for the ink jet print head that solves the problems noted above.
DISCLOSURE OF THE INVENTION
The problems noted above are solved by the present invention by connecting rigid ink supply and outlet tubes to the print head body at a nodal plane, and employing the rigid tubes to mount the ink jet print head by holding the tubes in a fixture. Internal channels are formed in the print head body, from the supply and outlet tubes located at the nodal plane to the ink reservoir. To isolate the acoustic vibrations of the ink in the internal channels from the vibrations of the orifice plate, the internal channels are offset from the reservoir in a direction perpendicular to the long axis of the print head body.
In a preferred mode of the present invention, the print head body is formed from two slabs of material, grooves representing the reservoir and internal channels are machined into one face of one of the slabs. The other slab has plane surfaces. The slabs are attached together to form the print head body. Functional inlet and outlet tubes are provided on one side of the print head body, and mounting studs are provided on the other side. The inlet and outlet tubes and the mounting studs are held in a mounting fixture.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view of an ink jet print head according to the present invention;
FIG. 2 is a perspective view showing the ink jet print head according to the present invention, and the mounting fixture; and
FIG. 3 is a perspective view of the prior art ink jet print head.
MODES OF CARRYING OUT THE INVENTION
A preferred mode of carrying out the present invention is illustrated in FIG. 1, where elements similar to FIG. 3 are similarly numbered. The ink jet print head 10 includes a print head body 12 formed by two halves 12a and 12b. The two halves of the print head body are machined from rectangular slabs of stainless steel. One of the slabs (12a) has grooves machined in one face thereof to define the ink reservoir 14 and the ink supply and outlet channels 28 and 30. The supply and outlet channels 28 and 30 emerge on the opposite face of the slab 12a in the region of a nodal plane to provide access to the ink supply and outlet tubes 26 and 32 respectively. The other slab 12b has a plane face on one side, and a pair of holes 31 for receiving mounting studs 33 on the other side. The two slabs of stainless steel are brazed together, face-to-face, to form the print head body 12. The orifice plate 18 is fixed to the print head body over the open end of the ink reservoir 14.
Rigid (e.g. stainless steel) supply and outlet tubes 26 and 32 and rigid mounting studs 33 are connected to the print head body at the nodal plane and serve for mounting the print head body. Referring now to FIG. 2, the print head body 12 is mounted by holding the supply and outlet tubes 26 and 32 and the mounting studs 33 in a frame 40 having grooves 42 and 44 for receiving the tubes and mounting studs. In practice, some tolerance is provided in the fit between the grooves and the tubes and studs. The print head 10 is set in the frame 40 in an alignment jig (not shown), and the tubes and studs are potted in the grooves using a curable epoxy.
The inventor discovered through experimentation that acoustic vibrations of the ink in the supply and outlet channels 28 and 30 (see FIG. 1) will interfere with the proper stimulation of the ink jets. To overcome this problem, the supply and outlet channels 28 and 30 are offset from the reservoir 14 such that the acoustic vibrations in the vertical columns of the channels are substantially isolated from the reservoir 14.
Because of the sharp bends 46 and 48 in the channels 28 and 30 due to the offset, the print head body is not easily machined from a solid block. For this reason, the preferred method of fabricating the print head body is by constructing the two halves and brazing them together. An alternative method of fabrication is by casting the print head body 12. However, this method has not proven entirely satisfactory because of the difficulty of removing the core material.
A print head body according to the present invention was constructed from stainless steel. The overall dimensions of the print head body 12 were 3.2 cm. long by 1.2 cm. wide by 0.6 cm. thick. An orifice plate having 64 orifices was attached to the print head body 12. The piezoelectric transducers 34 (see FIG. 2) were fixed to the edges of the print head body 12. A feedback transducer 46 was attached to the side of the print head body having the mounting studs 33. The feedback transducer 46 was employed in the driver circuit as described in the above referenced U.S. Pat. No. 4,563,688. The print head body was adjusted in the frame 40 as described above, and assembled in an ink jet printer. The print head was driven at a frequency of ≃75 Khz to perform ink jet printing. The print head according to the present invention exhibited substantially improved performance over the prior art print head, showing a decreased sensitivity to external vibrations, and less critical requirements for the mass and location of the ink supply and outlet lines connected to the ink supply and outlet tubes.
INDUSTRIAL APPLICABILITY AND ADVANTAGES
The present invention is useful in the field of ink jet printing, and has the advantage that the ink jet print head is less susceptible to external vibrations of the ink supply tubes. Mounting of the ink jet print head is facilitated, and the location and mass of the lines to the ink supply tubes are less critical.

Claims (5)

We claim:
1. An ink jet print head of the type having an elongated rectangular print head body defining an ink reservoir having an opening at one end of said elongated body, an orifice plate having a plurality of orifices fixed over said opening in said ink reservoir, for expelling ink from said orifices to form a plurality of ink jets, means for supplying ink under pressure to said reservoir, piezoelectric transducer means mounted on the exterior of said elongated body and extending in a longitudinal direction, for inducing longitudinal vibrations in said body to stimulate said ink jets, and mounting means for mechanically supporting said ink jet print head, said mounting means contacting said print head body at a nodal plane intermediate the ends of said print head body, characterized by: said means for supplying ink comprising rigid tube means connected to said print head body at said nodal plane and said mounting means comprising means for supporting said print head body by said rigid tube means.
2. The ink jet print head claimed in claim 1, wherein said tube means includes an inlet tube and an outlet tube, and said print head body further defines an inlet channel connecting said inlet tube from said nodal plane to said reservoir, and an outlet channel connecting said reservoir to said outlet tube at said nodal plane, said inlet and outlet channels extending generally parallel with the long axis of said print head body, and being offset with respect to said reservoir, whereby the acoustical vibrations of ink in said channels is effectively decoupled from the vibrations of said orifice plate.
3. The ink jet print head claimed in claim 2, wherein said print head body comprises a first rectangular slab having grooves formed in one face thereof to define said reservoir and said inlet and outlet channels, and a second rectangular slab having a plane face, said rectangular slabs being fixed together face-to-face.
4. The ink jet print head claimed in claim 3, wherein said slabs and said inlet and outlet tubes are stainless steel.
5. The ink jet print head claimed in claim 3, further including mounting studs on the side of said print head body opposite to said inlet and outlet tubes.
US06/901,669 1986-08-29 1986-08-29 Ink jet print head Expired - Lifetime US4683477A (en)

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Cited By (19)

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Publication number Priority date Publication date Assignee Title
US4937589A (en) * 1989-08-23 1990-06-26 Eastman Kodak Company Continuous ink jet print heads
US4999647A (en) * 1989-12-28 1991-03-12 Eastman Kodak Company Synchronous stimulation for long array continuous ink jet printer
US5394179A (en) * 1992-03-20 1995-02-28 Scitex Digital Printing, Inc. Stimulator for continous ink print head
WO1998028153A1 (en) * 1996-12-23 1998-07-02 Domino Printing Sciences Plc Continuous inkjet printer
WO1998031546A1 (en) * 1997-01-21 1998-07-23 Minnesota Mining And Manufacturing Company Tubing for an ink delivery system
US6460980B1 (en) * 1998-03-09 2002-10-08 Hegedus Gyoergy Liquid dispensing apparatus
US20080062218A1 (en) * 2006-09-08 2008-03-13 Seiko Epson Corporation Alignment jig and alignment apparatus for liquid-jet head and method for producing liquid-jet head
US8096642B2 (en) 1997-08-11 2012-01-17 Silverbrook Research Pty Ltd Inkjet nozzle with paddle layer arranged between first and second wafers
US8102568B2 (en) 1997-07-15 2012-01-24 Silverbrook Research Pty Ltd System for creating garments using camera and encoded card
US8274665B2 (en) 1997-07-15 2012-09-25 Silverbrook Research Pty Ltd Image sensing and printing device
US8285137B2 (en) 1997-07-15 2012-10-09 Silverbrook Research Pty Ltd Digital camera system for simultaneous printing and magnetic recording
US8421869B2 (en) 1997-07-15 2013-04-16 Google Inc. Camera system for with velocity sensor and de-blurring processor
US8789939B2 (en) 1998-11-09 2014-07-29 Google Inc. Print media cartridge with ink supply manifold
US8823823B2 (en) 1997-07-15 2014-09-02 Google Inc. Portable imaging device with multi-core processor and orientation sensor
US8866923B2 (en) 1999-05-25 2014-10-21 Google Inc. Modular camera and printer
US8896724B2 (en) 1997-07-15 2014-11-25 Google Inc. Camera system to facilitate a cascade of imaging effects
US8902333B2 (en) 1997-07-15 2014-12-02 Google Inc. Image processing method using sensed eye position
US8908075B2 (en) 1997-07-15 2014-12-09 Google Inc. Image capture and processing integrated circuit for a camera
US8936196B2 (en) 1997-07-15 2015-01-20 Google Inc. Camera unit incorporating program script scanner

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US4937589A (en) * 1989-08-23 1990-06-26 Eastman Kodak Company Continuous ink jet print heads
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US8902340B2 (en) 1997-07-12 2014-12-02 Google Inc. Multi-core image processor for portable device
US9544451B2 (en) 1997-07-12 2017-01-10 Google Inc. Multi-core image processor for portable device
US9338312B2 (en) 1997-07-12 2016-05-10 Google Inc. Portable handheld device with multi-core image processor
US8947592B2 (en) 1997-07-12 2015-02-03 Google Inc. Handheld imaging device with image processor provided with multiple parallel processing units
US8928897B2 (en) 1997-07-15 2015-01-06 Google Inc. Portable handheld device with multi-core image processor
US8953178B2 (en) 1997-07-15 2015-02-10 Google Inc. Camera system with color display and processor for reed-solomon decoding
US8285137B2 (en) 1997-07-15 2012-10-09 Silverbrook Research Pty Ltd Digital camera system for simultaneous printing and magnetic recording
US8421869B2 (en) 1997-07-15 2013-04-16 Google Inc. Camera system for with velocity sensor and de-blurring processor
US9584681B2 (en) 1997-07-15 2017-02-28 Google Inc. Handheld imaging device incorporating multi-core image processor
US8823823B2 (en) 1997-07-15 2014-09-02 Google Inc. Portable imaging device with multi-core processor and orientation sensor
US8836809B2 (en) 1997-07-15 2014-09-16 Google Inc. Quad-core image processor for facial detection
US9560221B2 (en) 1997-07-15 2017-01-31 Google Inc. Handheld imaging device with VLIW image processor
US8866926B2 (en) 1997-07-15 2014-10-21 Google Inc. Multi-core processor for hand-held, image capture device
US8896724B2 (en) 1997-07-15 2014-11-25 Google Inc. Camera system to facilitate a cascade of imaging effects
US8896720B2 (en) 1997-07-15 2014-11-25 Google Inc. Hand held image capture device with multi-core processor for facial detection
US8902357B2 (en) 1997-07-15 2014-12-02 Google Inc. Quad-core image processor
US8902324B2 (en) 1997-07-15 2014-12-02 Google Inc. Quad-core image processor for device with image display
US8102568B2 (en) 1997-07-15 2012-01-24 Silverbrook Research Pty Ltd System for creating garments using camera and encoded card
US8902333B2 (en) 1997-07-15 2014-12-02 Google Inc. Image processing method using sensed eye position
US8908075B2 (en) 1997-07-15 2014-12-09 Google Inc. Image capture and processing integrated circuit for a camera
US8908069B2 (en) 1997-07-15 2014-12-09 Google Inc. Handheld imaging device with quad-core image processor integrating image sensor interface
US8908051B2 (en) 1997-07-15 2014-12-09 Google Inc. Handheld imaging device with system-on-chip microcontroller incorporating on shared wafer image processor and image sensor
US8913182B2 (en) 1997-07-15 2014-12-16 Google Inc. Portable hand-held device having networked quad core processor
US8913137B2 (en) 1997-07-15 2014-12-16 Google Inc. Handheld imaging device with multi-core image processor integrating image sensor interface
US8913151B2 (en) 1997-07-15 2014-12-16 Google Inc. Digital camera with quad core processor
US8922670B2 (en) 1997-07-15 2014-12-30 Google Inc. Portable hand-held device having stereoscopic image camera
US8922791B2 (en) 1997-07-15 2014-12-30 Google Inc. Camera system with color display and processor for Reed-Solomon decoding
US9432529B2 (en) 1997-07-15 2016-08-30 Google Inc. Portable handheld device with multi-core microcoded image processor
US8934027B2 (en) 1997-07-15 2015-01-13 Google Inc. Portable device with image sensors and multi-core processor
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